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Old 11-03-2016, 08:41 PM   #1
beanious
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Smile LED Flasher that works with 67-72 Chevy Trucks

All, this last week I went through the process of changing all my bulbs to LED and the flashers too. This should make them last "almost" forever and alleviate blown out bulbs. I have documented the pictures and the process I went through in finding a flasher that actually worked for our trucks. See below, 4th and 5th pics were the one that worked. I got it from Summit Racing part# UPD-90652.

Last edited by beanious; 11-03-2016 at 08:47 PM.
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Old 11-03-2016, 08:41 PM   #2
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Re: LED Flasher that works with 67-72 Chevy Trucks

1st pic original relay (Did not work with LEDs)
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Old 11-03-2016, 08:42 PM   #3
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Re: LED Flasher that works with 67-72 Chevy Trucks

2nd pic second relay (Did not work with LEDs)
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Old 11-03-2016, 08:43 PM   #4
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Re: LED Flasher that works with 67-72 Chevy Trucks

3rd pic third relay (Did not work with LEDs)
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Old 11-03-2016, 08:43 PM   #5
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Re: LED Flasher that works with 67-72 Chevy Trucks

4th pic fourth relay (Works with LEDs)
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Old 11-03-2016, 08:44 PM   #6
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Re: LED Flasher that works with 67-72 Chevy Trucks

5th pic fourth relay installed (no black boot on the top relay, black boot on bottom relay)
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Old 11-03-2016, 08:45 PM   #7
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Re: LED Flasher that works with 67-72 Chevy Trucks

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4th pic fourth relay (Works with LEDs)
Good stuff,

Please post the part number of the good one.

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Old 11-03-2016, 08:51 PM   #8
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Re: LED Flasher that works with 67-72 Chevy Trucks

No prob, I got it from Summit Racing part# UPD-90652.
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Old 06-25-2019, 09:52 PM   #9
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Re: LED Flasher that works with 67-72 Chevy Trucks

I have had issues trying to figure this out all year. I finally crossed the wires on the bottom flasher and it worked!! I am using led flashers from auto zone. I have 4 different flashers and the only thing that worked was crosses the wires on the bottom flasher.
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Old 06-26-2019, 10:10 AM   #10
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Re: LED Flasher that works with 67-72 Chevy Trucks

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I have had issues trying to figure this out all year. I finally crossed the wires on the bottom flasher and it worked!! I am using led flashers from auto zone. I have 4 different flashers and the only thing that worked was crosses the wires on the bottom flasher.
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Yep! I went through that nightmare on my AMX. It all worked on the bench but not in the car, finally dawned on me to swap the flasher wires in the car. Polarity matters with LEDs.
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Old 06-26-2019, 01:45 PM   #11
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Re: LED Flasher that works with 67-72 Chevy Trucks

I'm sub'd for this. Going to ask a "dumb" question, though - What's the black adapter, or boot, part for? Is that just to make it fit the fuse block? And, is that grounded to your brake pedal?
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Old 06-26-2019, 02:28 PM   #12
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Re: LED Flasher that works with 67-72 Chevy Trucks

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I'm sub'd for this. Going to ask a "dumb" question, though - What's the black adapter, or boot, part for? Is that just to make it fit the fuse block? And, is that grounded to your brake pedal?
I didnít have a boot, I think itís just a stock photo. The flashers that Iím using now donít have a ground wire. Just ground wherever you can.
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Old 06-26-2019, 03:03 PM   #13
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Re: LED Flasher that works with 67-72 Chevy Trucks

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I'm sub'd for this. Going to ask a "dumb" question, though - What's the black adapter, or boot, part for? Is that just to make it fit the fuse block? And, is that grounded to your brake pedal?
The flasher that have that wire, it is for ground and needs to be hooked to ground. Some others do not have the ground wire, mine don't.
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Old 10-08-2019, 02:00 PM   #14
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Re: LED Flasher that works with 67-72 Chevy Trucks

Do our trucks need 1 or 2 of these?
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Old 10-08-2019, 02:11 PM   #15
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Re: LED Flasher that works with 67-72 Chevy Trucks

I'm pretty sure you need to use the same flasher for the emergency flashers as well. So they both have to be the same.
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Old 10-08-2019, 02:29 PM   #16
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Thumbs up Re: LED Flasher that works with 67-72 Chevy Trucks

I replaced both, one for turn signals and one for hazzards.
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Old 10-08-2019, 02:54 PM   #17
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Re: LED Flasher that works with 67-72 Chevy Trucks

Just ordered them. Thanks
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Old 10-08-2019, 03:24 PM   #18
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Thumbs up Re: LED Flasher that works with 67-72 Chevy Trucks

There are a bunch of post's on this subject.

Been running these for years. The boot changes the polarity on the flasher. Been there done that.
Make sure all the wires are ran the same. Make sure everything is grounded good also.Always use the grounded flasher's for LED lights and yes you will need 2 of them if you have hazards.
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Old 10-09-2019, 03:21 PM   #19
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Re: LED Flasher that works with 67-72 Chevy Trucks

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There are a bunch of post's on this subject.

Been running these for years. The boot changes the polarity on the flasher. Been there done that.
Make sure all the wires are ran the same. Make sure everything is grounded good also.Always use the grounded flasher's for LED lights and yes you will need 2 of them if you have hazards.
Great info Andy! Just a fyi to all. I have an easy wiring harness in my truck and the polarity on the turn signal flasher is opposite of the hazard flasher. Now that will make you pull hair out wondering why they work on hazard but not turns lol. In a pinch load resistors will work with stock flashers. But im not a fan of the thought of a direct short on purpose 😬
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Old 10-09-2019, 04:47 PM   #20
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Re: LED Flasher that works with 67-72 Chevy Trucks

Thanks for the fast response. Awesome wealth of info on this site from everyone! Ordered the parts on amazon and coming this week.
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Old 10-09-2019, 06:02 PM   #21
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Re: LED Flasher that works with 67-72 Chevy Trucks

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5th pic fourth relay installed (no black boot on the top relay, black boot on bottom relay)
I did mine couple years ago using exact same flasher and exact same polarity orientation. I have the ground wire on mine and grounded it to high beam switch floor bolts.
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